android, desktop, core: option to show toolbar in chat at the top in reachable UI (#5316)

* android, desktop: ability to show toolbar in chat at the top in reachable UI

* rename

* core AppSettings

* ios AppSettings

* rename

* strings, enable reachable chat toolbar when enabled reachable app toolbars

---------

Co-authored-by: Evgeny Poberezkin <evgeny@poberezkin.com>

apps/multiplatform/common/src/androidMain/kotlin/chat/simplex/common/platform/ScrollableColumn.android.kt

@@ -29,6 +29,7 @@ actual fun LazyColumnWithScrollBar(
   flingBehavior: FlingBehavior,
   userScrollEnabled: Boolean,
   additionalBarOffset: State<Dp>?,
+  chatBottomBar: State<Boolean>,
   fillMaxSize: Boolean,
   content: LazyListScope.() -> Unit
 ) {
@@ -91,6 +92,7 @@ actual fun LazyColumnWithScrollBarNoAppBar(
   flingBehavior: FlingBehavior,
   userScrollEnabled: Boolean,
   additionalBarOffset: State<Dp>?,
+  chatBottomBar: State<Boolean>,
   content: LazyListScope.() -> Unit
 ) {
   val state = state ?: rememberLazyListState()

apps/multiplatform/common/src/androidMain/kotlin/chat/simplex/common/views/usersettings/Appearance.android.kt

@@ -106,7 +106,12 @@ fun AppearanceScope.AppearanceLayout(
       }
       //      }
 
-      SettingsPreferenceItem(icon = null, stringResource(MR.strings.one_hand_ui), ChatModel.controller.appPrefs.oneHandUI)
+      SettingsPreferenceItem(icon = null, stringResource(MR.strings.one_hand_ui), ChatModel.controller.appPrefs.oneHandUI) { enabled ->
+        if (enabled) appPrefs.chatBottomBar.set(true)
+      }
+      if (remember { appPrefs.oneHandUI.state }.value) {
+        SettingsPreferenceItem(icon = null, stringResource(MR.strings.chat_bottom_bar), ChatModel.controller.appPrefs.chatBottomBar)
+      }
     }
 
     SectionDividerSpaced()